15-20 or anything up to about 45 pounds are chickens, and good eating...halibut are all over the place, best around 100-200 feet... anything over that and one gets really pissed off when a rockfish takes the bait and you have to reel up and rebait....
Last one I caught was 46 lbs, my buddy pulled in one at 107lbs...or shall I say pulled ashore then loaded it in! Nice to have the rifle handy too so they don't break your leg flipping around....